Some more information from another source;
Should commercial production of Coretrack’s ceramic proppant come to fruition, then this would represent the world’s only commercial scale plant producing ceramic proppants based on fly ash feedstock raw material.
Until the end of January 2015, that title was held by
Oxane Materials’ Van Buren plant in Arkansas, USA. However, the company abruptly ceased operations in the New Year and closed the plant.
The move was followed by a string of announcements from the major
ceramic proppant players idling production capacity in the face of falling demand owing to the oil price crash.
Coretrack’s concept is that its licensed technology would be used in satellite proppant plants established near coal-fired power plants (the source of the fly ash feedstock raw material) in proximity to shale oil and gas plays.
The notion of using a waste material such as fly ash as the main feedstock raw material is not only environmentally sound, but also contributes to cost savings in either producing/processing or procuring supplies of calcined bauxite and/or kaolin.
http://imformed.com/ceramic-proppant-pilot-plant-commissioning-in-australia/